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For all we know, Earth is like some terrarium that alien visitors come by to look at for slap-stick entertainment, or to study our primitive ways.
Of course, the UFOs seen could be some sort of unmanned probes to examine our environment.
If they are 'manned spacecraft', whoever is aboard would most likely not have some primal urge to destroy the hairless chimp tribes. Such advanced beings would probably just want to observe our civilization though, studying us, running experiments on us and other Earth dwellers.
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